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public static class StructGetter
{
public static void WriteBlock(Stream Output, object structure)
{
byte[] buf = new byte[SizeOf(structure)];
WriteBlock(Output, structure, buf);
}
public static void WriteBlock(Stream Output, object structure, byte[] buf)
{
GetBytes(structure, buf, 0, buf.Length);
Output.Write(buf, 0, SizeOf(structure));
}
public static object ReadBlock(Stream Input, Type structure_type)
{
byte[] buf = new byte[Marshal.SizeOf(structure_type)];
return ReadBlock(Input, structure_type, buf);
}
public static object ReadBlock(Stream Input, Type structure_type, byte[] buf)
{
if (Input.Read(buf, 0, Marshal.SizeOf(structure_type)) < Marshal.SizeOf(structure_type))
throw new DreamShield.Data.InvalidDataException("Stream too short");
return GetStruct(buf, 0, Marshal.SizeOf(structure_type), structure_type);
}
public static int SizeOf(object structure)
{
return Marshal.SizeOf(structure);
}
public static void GetBytes(object val,
[In, Out] byte[] buffer,
int offset,
int bufsize)
{
if (val == null)
throw new ArgumentNullException("val");
int size = SizeOf(val);
IntPtr p = Marshal.AllocHGlobal(size);
try
{
Marshal.StructureToPtr(val, p, true);
Marshal.Copy(p, buffer, offset, bufsize);
}
finally
{
Marshal.FreeHGlobal(p);
}
}
public static object GetStruct(byte[] buffer,
int offset,
int count,
Type struct_type)
{
IntPtr p = Marshal.AllocHGlobal(count);
object result = null;
try
{
Marshal.Copy(buffer, offset, p, count);
result = Marshal.PtrToStructure(p, struct_type);
}
finally
{
Marshal.FreeHGlobal(p);
}
return result;
}
} |
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